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                        /JavaScript進階篇

幫我找一下錯

代碼不能正常運行，各位大神幫我看看

<!DOCTYPE HTML>
<html>
??? <head>
??????? <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
??????? <title>無標題文檔</title>
??? </head>
?? ?
??? <body>
??????? <form>
????????? 請選擇你愛好:<br>
????????? <input type="checkbox" name="hobby" id="hobby1">? 音樂
????????? <input type="checkbox" name="hobby" id="hobby2">? 登山
????????? <input type="checkbox" name="hobby" id="hobby3">? 游泳
????????? <input type="checkbox" name="hobby" id="hobby4">? 閱讀
????????? <input type="checkbox" name="hobby" id="hobby5">? 打球
????????? <input type="checkbox" name="hobby" id="hobby6">? 跑步 <br>
????????? <input type="button" value = "全選" onclick = "checkall();">
????????? <input type="button" value = "全不選" onclick = "clearall();">
????????? <p>請輸入您要選擇愛好的序號，序號為1-6:</p>
????????? <input id="wb" name="wb" type="text" >
????????? <input name="ok" type="button" value="確定" onclick = "checkone();">
??????? </form>
??????? <script type="text/javascript">
??????? function checkall(){
??????????? var hobby = document.getElementsByTagName("input");
?????????? for (var i = 0; i < hobby.length; i++) {
???????????? hobby[i].checked=true;
?????????? }
????????? ?
??????? }
??????? function clearall(){
??????????? var hobby = document.getElementsByName("hobby");
?????????? ?
???????? for (var i = 0; i < hobby.length; i++) {
?????????? hobby[i].checked=false;
???????? }
?????????? ?
??????? }
?????? ?
??????? function checkone(){
????????? clearall();
??????????? var j=document.getElementById("wb").value;
??????????? var hobby = document.getElementsByName("hobby");
??????????? for (var i = 0; i < j.length; i++) {
????????????? if ((j.charAt(i)>6) || (j.charAt(i)<1)) {
??????????????? alert("越界，請重新輸入！");
??????????????? document.getElementById("wb").value="";
????????????? }
????????????? for (var n = 0; n < j.length; n++) {
????????????????????? hobby[(j.charAt(n))-1].checked=true;
????????????? }
??????? ?
??????? ?
?????? ?
??????? }
?????? ?
??????? </script>
??? </body>
</html>